body {
    background-color: #FFFFFF;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.nav-links {
    background-color: #F2F1EE;
    border-radius: 12px;
    padding: 10px 6px;
}

.nav-links ul {
    list-style: none;
    display: flex;
    gap: 12px;
    margin: 0;
    padding: 0;
}

header {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    padding: 20px 40px;
}

nav {
    grid-column: 2;
    justify-self: center;
}

nav a {
    text-decoration: none;
    color: #333333;
    border-radius: 8px;
    padding: 5px 8px;
    font-weight: 500;
}

nav a:hover {
    background-color: #03045E;
    color: #FFFFFF;
}

.book-call {
    background-color: #D81E5B;
    color: #FFFFFF;
    border-radius: 8px;
    padding: 10px 16px;
    justify-self: end;
    grid-column: 3;
    text-decoration: none;
    font-weight: 600;
}

.book-call:hover {
    background-color: #03045E;
    color: #FFFFFF;
}

header h3 {
    justify-self: start;
    margin-left: 20px;
}

.about-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: start;
    gap: 40px;
    padding: 60px 80px;
    box-sizing: border-box;
    min-height: calc(100vh - 100px);
}

.about-content {
    max-width: 900px;
}

.about-intro {
    color: #03045E;
    font-size: 44px;
    line-height: 1.2;
    margin-bottom: 24px;
}

.description {
    color: #666666;
    font-size: 20px;
    line-height: 1.6;
}

.about-buttons {
    display: flex;
    gap: 16px;
    margin-top: 30px;
    font-weight: 600;
}

.button-topics,
.button-howitworks {
    background-color: #F7E733;
    color: #03045E;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 900;
}

.button-topics:hover,
.button-howitworks:hover {
    background-color: #03045E;
    color: #FFFFFF;
}

.about-image img {
    width: 100%;
    max-width: 250px;
    height: auto;
    display: block;
    border-radius: 16px;
    border: 5px solid #03045E;
    box-sizing: border-box;
}

.about-image {
    justify-self: end;
    margin-right: 80px;
    position: relative;
}

.about-image::before {
    content: "";
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: #F7E733;
    border-radius: 16px;
    top: 16px;
    left: 16px;
    z-index: -1;
    pointer-events: none;
}

@media (max-width: 768px) {
    header {
        padding: 20px;
        grid-template-columns: 1fr;
        gap: 16px;
    }

    nav {
        grid-column: 1;
    }

    .book-call {
        grid-column: 1;
        justify-self: center;
    }

    .about-section {
        grid-template-columns: 1fr;
        padding: 40px 20px;
        gap: 30px;
    }

    .about-intro {
        font-size: 32px;
    }

    .description {
        font-size: 18px;
    }

    .about-image {
        justify-self: center;
        margin-right: 16px;
    }
     .topics-section {
        padding: 50px 20px;
    }

    .topics-heading h2 {
        font-size: 32px;
    }

    .topics-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .topic-card {
        padding: 24px;
    }
}

nav a[href="#about"] {
    background-color: #03045E;
    color: #FFFFFF;
}

.topics-section {
    background-color: #FBFEF9;
    padding: 80px;
}

.topics-heading {
    max-width: 100%;
    margin: 0 auto 40px;
    text-align: center;
}

.topics-label {
    color: #D81E5B;
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 2px;
}

.topics-heading h2 {
    color: #03045E;
    font-size: 40px;
    margin-bottom: 16px;
}

.topics-description {
    color: #666666;
    font-size: 18px;
    line-height: 1.6;
    white-space: nowrap;
    text-align: center;
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 1000px;
    margin: 0 auto;
}

.topic-card {
    background-color: #FFFFFF;
    padding: 30px;
    border-radius: 16px;
    border: 2px solid transparent;
    transition: border-color 0.2s, transform 0.2s;
    border: 2px solid #E0E0E0;
    cursor: pointer;
}

.topic-card h3 {
    color: #03045E;
    font-size: 22px;
    margin-top: 0;
    margin-bottom: 12px;
}

.topic-card p {
    color: #666666;
    font-size: 16px;
    line-height: 1.6;
    margin-bottom: 0;
}


.topic-card:hover {
    background-color: #03045E;
    border-color: #03045E;
    transform: translateY(-4px);
}

.topic-card.selected {
    border-color: #03045E;
    background-color: #03045E;
}

.topic-card.selected h3,
.topic-card.selected p {
    color: #FFFFFF;
}

.topic-card:hover h3,
.topic-card:hover p {
    color: #FFFFFF;
}

.topics-layout {
    max-width: 1200px;
    margin: 0 auto;
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.topic-details {
    display: none;
}

.topics-layout.active {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: start;
}

.topics-layout.active .topics-grid {
    grid-template-columns: 1fr;
    gap: 16px;
}

.topics-layout.active .topic-details {
    display: block;
    background-color: #F2F1EE;
    border-radius: 16px;
    padding: 30px;
}

.topic-details h3 {
    color: #03045E;
    font-size: 24px;
    margin-top: 0;
}

.topic-details p {
    color: #000000;
    font-size: 16px;
    line-height: 1.7;
}

.use-cases-section {
    background-color: #FBFEF9;
    padding: 80px;
}

.use-cases-heading {
    max-width: 800px;
    margin: 0 auto 50px;
    text-align: center;
}

.use-cases-label {
    color: #D81E5B;
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 2px;
}

.use-cases-heading h2 {
    color: #03045E;
    font-size: 40px;
    margin-bottom: 16px;
}

.use-cases-heading > p:last-child {
    color: #666666;
    font-size: 18px;
    line-height: 1.6;
}

.use-cases-layout {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
}

.use-case-card {
    position: relative;
    min-width: 0;
    min-height: 230px;
    border: 3px solid transparent;
    border-radius: 16px;
    overflow: hidden;
    cursor: pointer;
}

.use-case-card:hover {
    border-color: #03045E;
}

.use-case-card img {
    display: block;
    width: 100%;
    height: 230px;
    object-fit: cover;
    object-position: center 35%;
    transition: transform 0.4s ease;
}

.use-cases-grid .use-case-card:nth-child(3) img {
    object-position: center center;
}

.use-case-card:hover img,
.use-case-card.selected:hover img {
    transform: scale(1.05);
}

.use-case-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 24px;
    color: #FFFFFF;
    background: linear-gradient(
        transparent 20%,
        rgba(3, 4, 94, 0.9) 100%
    );
}

.use-case-overlay h3 {
    font-size: 21px;
    margin: 0 0 10px;
}

.use-case-overlay span {
    color: #F7E733;
    font-size: 14px;
    font-weight: 600;
}

.use-cases-details {
    display: none;
}

.use-case-card.selected {
    border-color: #03045E;
}

.use-case-card:focus-visible {
    outline: 3px solid #D81E5B;
    outline-offset: 4px;
}

.use-cases-layout.active {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 30px;
    align-items: start;
}

.use-cases-layout.active .use-cases-grid {
    grid-column: 1;
    grid-row: 1;
    grid-template-columns: 1fr;
    gap: 16px;
}

.use-cases-layout.active .use-cases-details {
    display: block;
    grid-column: 2;
    grid-row: 1;
    background-color: #F2F1EE;
    border-radius: 16px;
    padding: 30px;
}

.use-cases-layout.active .use-case-card {
    min-height: 145px;
}

.use-cases-layout.active .use-case-card img {
    height: 145px;
}

.use-cases-layout.active .use-case-overlay {
    padding: 16px;
}

.use-cases-details h3 {
    color: #03045E;
    font-size: 28px;
    line-height: 1.3;
    margin-top: 0;
}

.use-cases-details #use-case-description p {
    color: #555555;
    font-size: 16px;
    line-height: 1.7;
    margin-bottom: 16px;
}

.use-cases-details ul {
    color: #555555;
    font-size: 16px;
    line-height: 1.7;
    margin-bottom: 16px;
}

.use-cases-details #use-case-description p:last-child {
    margin-bottom: 0;
}

@media (max-width: 768px) {
    .use-cases-section {
        padding: 50px 20px;
    }

    .use-cases-heading h2 {
        font-size: 32px;
    }

    .use-cases-layout.active {
        grid-template-columns: 1fr;
    }

    .use-cases-layout.active .use-cases-details {
        grid-column: 1;
        grid-row: 1;
    }

    .use-cases-layout.active .use-cases-grid {
        grid-column: 1;
        grid-row: 2;
        grid-template-columns: 1fr;
    }
}

.how-it-works-section {
    background-color: #FFFFFF;
    padding: 80px;
}

.how-it-works-heading {
    max-width: 800px;
    margin: 0 auto 50px;
    text-align: center;
}

.how-it-works-label {
    color: #D81E5B;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 2px;
}

.how-it-works-heading h2 {
    color: #03045E;
    font-size: 40px;
    margin-bottom: 16px;
}

.how-it-works-heading > p:last-child {
    color: #666666;
    font-size: 18px;
    line-height: 1.6;
}

.how-it-works-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.how-step-card {
    background-color: #F2F1EE;
    padding: 32px;
    border-radius: 16px;
    border: 2px solid transparent;
    transition: transform 0.2s, border-color 0.2s;
}

.how-step-card:hover {
    transform: translateY(-5px);
    border-color: #03045E;
}

.step-number {
    display: inline-block;
    color: #D81E5B;
    font-size: 30px;
    font-weight: 800;
    margin-bottom: 20px;
}

.how-step-card h3 {
    color: #03045E;
    font-size: 22px;
    margin-top: 0;
    margin-bottom: 16px;
}

.how-step-card p {
    color: #666666;
    font-size: 16px;
    line-height: 1.7;
}

.step-link {
    display: inline-block;
    margin-top: 12px;
    color: #03045E;
    font-weight: 700;
    text-decoration: none;
}

.step-link:hover {
    color: #D81E5B;
}

@media (max-width: 768px) {
    .how-it-works-section {
        padding: 50px 20px;
    }

    .how-it-works-heading h2 {
        font-size: 32px;
    }

    .how-it-works-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .how-step-card {
        padding: 26px;
    }
}

footer {
  text-align: center;
  padding: 20px;
  font-size: 14px;
  color: #888;
}